/*
 * Copyright 2008 Michal Trzcinka
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.trzcinka.intellitrac.utils;

import org.apache.commons.lang.StringUtils;

public final class StringConversionUtils {

  private StringConversionUtils() {
  }

  public static String toUnderscore(String mixedCaseExpression) {
    String[] values = StringUtils.splitByCharacterTypeCamelCase(mixedCaseExpression);
    String[] result = new String[values.length * 2];
    for (int i = 0; i < values.length; i++) {
      String value = values[i];
      result[i * 2] = value.toLowerCase();
      if (i < values.length - 1) {
        result[i * 2 + 1] = "_";
      }
    }
    return StringUtils.join(result);
  }

}